Cyperus 



Cyperaceae 



187 



o 55 



Map 347 



Cyperus ovularis (Michx) Torr. 



~W 



Map 348 



Cyperus filiculmis Vahl 



50 



Map 349 

 Cyperus filiculmis 

 var macilentus Fern 



is from a dry, sandy ridge in Gibson County. Geise (Amer. Midland Nat. 

 15: 254. 1934) cites specimens from Lake, La Porte, Marshall, Porter, and 

 St. Joseph Counties, but I refer these specimens to the variety. 



8a. Cyperus filiculmis var. macilentus Fern. Map 349. This variety 

 grows in very sandy soil and is found mostly on sand ridges and dunes, in 

 sandy fallow fields, and in the moist intervening sandy areas between sand 

 ridges and dunes. In its habitat it is usually frequent, elsewhere it is 

 absent. Its distribution in the state is well represented by the map. 



Cent. Maine, sw. Que. to Minn., southw. to Va., Ohio, Ind., 111., and Mo. 



9. Cyperus dentatus Torr. (Including Cyperus dentatus var. cteno- 

 stachys Fern.) Map 350. This Coastal Plain species is found in only 

 three counties. It is local but usually common where it is found. It 

 grows in moist, sandy soil in ditches through marshes and on the wet, 

 sandy shore of Bass Lake in Starke County. Specimens with 15-40- 

 flowered spikelets have received a varietal name, but since both short and 

 long spikelets are found on the same plant it is obvious that the variety 

 is only a luxuriant form of the species. 



N. S. to Inch, southw. to N. C. ; principally near the coast. 



10. Cyperus Houghtonii Torr. Map 351. This is a species of the dune 

 area and it has been found only in Lake and Porter Counties. 



Mass. to Man. and Oreg., southw. to Va., Kans., and Ariz. 



11. Cyperus Schweinitzii Torr. Map 352. This species grows in very 

 dry sand and has its mass distribution on the dunes near Lake Michigan. 

 The Warren County specimen was found on the very high, gravelly bank 

 along the Big Four Railroad about 2 miles northwest of Covington. 



Western N. Y., s. Ont. to Man., southw. to Ind. and Kans. 



X Cyperus mesochorus Geise. (Cyperus Houghtonii X Schweinitzii.) 

 This hybrid is described in Amer. Midland Nat. 15 : 249-250. 1934. Geise 



